EP2305406B1 - Cutting tool and cutting method using same - Google Patents

Cutting tool and cutting method using same Download PDF

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Publication number
EP2305406B1
EP2305406B1 EP09770250.0A EP09770250A EP2305406B1 EP 2305406 B1 EP2305406 B1 EP 2305406B1 EP 09770250 A EP09770250 A EP 09770250A EP 2305406 B1 EP2305406 B1 EP 2305406B1
Authority
EP
European Patent Office
Prior art keywords
holder
region
outer peripheral
wall surface
cutting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09770250.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2305406A1 (en
EP2305406A4 (en
Inventor
Yoshihiro Inoue
Masao TAKAO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Publication of EP2305406A1 publication Critical patent/EP2305406A1/en
Publication of EP2305406A4 publication Critical patent/EP2305406A4/en
Application granted granted Critical
Publication of EP2305406B1 publication Critical patent/EP2305406B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/02—Boring bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/007—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor for internal turning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B29/00—Holders for non-rotary cutting tools; Boring bars or boring heads; Accessories for tool holders
    • B23B29/04—Tool holders for a single cutting tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2205/00—Fixation of cutting inserts in holders
    • B23B2205/12—Seats for cutting inserts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/22—Cutters, for shaping including holder having seat for inserted tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/22—Cutters, for shaping including holder having seat for inserted tool
    • Y10T407/2268—Cutters, for shaping including holder having seat for inserted tool with chip breaker, guide or deflector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/22—Cutters, for shaping including holder having seat for inserted tool
    • Y10T407/2272—Cutters, for shaping including holder having seat for inserted tool with separate means to fasten tool to holder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/22—Cutters, for shaping including holder having seat for inserted tool
    • Y10T407/2272—Cutters, for shaping including holder having seat for inserted tool with separate means to fasten tool to holder
    • Y10T407/2274—Apertured tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/03—Processes
    • Y10T408/04—Bit detachable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T82/00—Turning
    • Y10T82/25—Lathe
    • Y10T82/2585—Tool rest
    • Y10T82/2587—Turret type holder [e.g., multiple tools, etc.]

Definitions

  • the holder 3 has a mounting portion (insert pocket 6) on the front thereof.
  • the insert 2 is mounted in the insert pocket 6.
  • the cutting edge 21 protrudes from a front surface 31 and an outer peripheral surface 4 of the holder 3. That is, the cutting edge 21 protrudes toward the front side relative to the front surface 31 and toward the outside relative to the outer peripheral surface 4 of the holder 3.
  • the side surface and the lower surface of the insert 2 abut the insert pocket 6.
  • the first wall surface portion 7 extends from the periphery of the insert pocket 6 toward the rear end side.
  • a lower end 71 L of the front-side edge portion of the first wall surface portion 7 is located on the lower side relative to the front t of the cutting edge 21.
  • an upper end 71 H of the front-side edge portion 71 of the first wall surface portion 7 is located on the upper side relative to the front t of the cutting edge 21. It can be stated that the front side edge portion 71 of the first wall surface portion 7 is arranged from the upper side toward the lower side of the front t of the cutting edge 21 as viewed from the side surface.
  • the regular turning tool is a turning tool used for machining forms in which the holder 3 is attached on an external device so that the rake surface of the insert 2 is directed toward the upper side.
  • the reverse turning tool is a turning tool used for machining forms in which the holder 3 is attached on an external device so that the rake surface of the insert 2 is directed toward the lower side.
  • a holder reference surface 5 is a surface that becomes a reference surface when attaching the cutting tool 1 on an external device. That is, the holder reference surface 5 is a surface that is utilized for positioning the holder when attaching it on an external device. In the present embodiment, the holder reference surface 5 is located on the upper surface side of the holder 3 and is a plane surface that extends along the axis of the holder 3 as shown in Fig. 1 B .
  • the tool 1 of the present embodiment has features at the second wall surface portion of the holder 3.
  • the second wall surface portion 8 intersects with a surface portion that is located on the upper side within the outer peripheral surface of the holder 3. That is, the second wall surface portion 8 comprises an upper end portion 11 at the intersection with a surface portion that is located on the upper side within the outer peripheral surface of the holder 3.
  • the first wall surface portion is provided, this configuration may be similar to the first to third embodiments, for example.
  • the first wall surface portion will be described below.
  • the tool 1 comprises the first region and the second region that satisfy the relationship of ⁇ 811> ⁇ 812 as described above, and therefore, chips generated by the cutting tool 21 are transferred smoothly to the second region 812 that is located on the outer peripheral surface 4B side along the first region 811 that is inclined so as to be located on the upper side as approaching the rear end as viewed from the side surface and is provided with an inclination with respect to the outer peripheral surface 4B with the angle ⁇ 811 as viewed from a planar surface.
  • the chips that approach this second region 812 are discharged outside of the tool 1 because the second region 812 is provided along the axis L of the holder and provided with an inclination so as to be located on the lower side as approaching the outer peripheral surface 4B in a cross-section perpendicular to the axis L of the holder. Accordingly, the clogging of chips between the workpiece and the front surface 31 of the holder 3 can be constrained. As a result, it is possible to constrain both the scratching of chips against the machined wall surface and the deterioration of the machining accuracy.
  • the first region 811 is provided with an inclination so as to leave from the holder reference surface 5 as approaching the outer peripheral surface 4B.
  • the first region 811 forms a concave-curved surface shape in the cross-section perpendicular to the axis L of the holder.
  • the first region 811 intersects with the outer peripheral surface 4B as viewed from the planar surface and is convexly curved toward the outer peripheral surface 4B side. That is, the first region 811 of the second wall surface portion 8 forms a convex shape toward the outside in a cross-section parallel to the holder reference surface 5 described below.
  • the center O of the curvature radius R of the second wall surface portion 8 is located on the outer peripheral surface 4A side with respect to the axis L or the holder 3. Accordingly, a wider chip pocket can be ensured in the radial direction of the holder 3. As a result, the effect of smoothly discharging chips will be increased.
  • the rising angle ⁇ 2 as used herein refers to, in the abovementioned cross-section, the angle between the tangential line of the second wall surface portion 8 and a line parallel to the holder reference surface 5 at the lower end portion 12.
  • a rising angle ⁇ 6 of the third region 813 at the upper end portion 11 of the third region 813 is greater than the rising angle ⁇ 5 at the lower end portion of the second wall surface portion 8 as viewed from the side surface. Accordingly, an opening portion for a supply hole for cutting fluid can be provided on the third region 813. Therefore, the cutting fluid can be appropriately supplied around the cutting edge 21. As a result, temperature increases of the cutting edge during cutting can be effectively constrained.
  • the second wall surface portion 8 is located on the front side of the first region 811 and comprises a fourth region 814 that intersects with the front surface 31 of the holder 3.
  • the fourth region 814 is arranged so as to be substantially parallel to the holder reference surface 5. With such a configuration, a wider opening region toward the outside of the front side of the holder 3 can be ensured.
  • the first region 811 is located on the holder reference surface 5 side relative to the cutting edge 21.
  • the boundary portion between the first region 811 and the fourth region 814 is located on the front side relative to the rear end of the insert pocket 6.
  • the boundary portion is formed on the front side relative to a corner portion with an acute angle that is not involved in cutting and is positioned on the rear end side among two corner portions having acute angles. Therefore, the fourth region 814 is arranged on the front surface 31 side of the holder 3, and the first region 811 is arranged on the periphery of the corner portion having an acute angle on the rear end side where large stress is easily concentrated during cutting.
  • the second region 812 and the fifth region 715 are provided such that at least a part of them is arranged at same position in the direction of the axis L of the holder as viewed from the planar surface.
  • the holder 3 will comprise a region in which the cross-sectional area does not vary along the axis L of the holder. Accordingly, the effect of constraining chattering that is generated during cutting will be increased.
  • the tool 1 of the present example is different from the tool of the fourth embodiment in the configuration of the holder 3.
  • the holder 3 does not comprise the first wall surface portion 7 and the third region 813. That is, the insert pocket 6 connects to the first region 811 directly without going through the third region 813.
  • a tool 1 according to a fifth embodiment of the present invention is described in detail below with using Figs. 11 .
  • the tool 1 of the present embodiment is different from the tool of the fourth embodiment in the shape of the second wall surface portion 8.
  • a connecting surface 13 is provided between the first region 811 and the second region 812.
  • the second wall surface portion is located on the front side of the first region 811 and comprises the fourth region 814 that intersects with the front surface 31 of the holder 3.
  • the fourth region 814 is arranged so as to be substantially parallel to the holder reference surface 5. Accordingly, a wider opening region toward the outside of the front side of the holder 3 can be ensured.
  • the tool 1 of the present embodiment is different from the tool 1 of the fourth embodiment in the shape of the first region 811 and the second region 812.
  • a tool 1 according to a seventh embodiment of the present invention is described in detail below with using Figs. 13 .
  • the connecting surface is not provided between the first region 811 and the second region 812.
  • the connecting surface is not provided between the first region 811 and the second region 812.
  • the first wall surface portion 7 is not provided on the outer peripheral surface 4A side. That is, in the present embodiment, the outer peripheral surface 4A side is composed of part of a substantially cylindrical surface. With such a configuration, the rigidity of the front side of the holder 3 can be increased. In particular, in the present embodiment, it is useful if the holder is used in machining forms in which a wider chip-discharging space can be ensured on the outer peripheral surface 4B side because both good chip-discharging properties and holder rigidity can be provided.
  • the holder 3 comprises a land portion 32 on the rear end side relative to the insert pocket 6 (cutting insert 2).
  • This land portion 32 comprises the first wall surface portion 7 that extends from the front side of the holder 3 (hereinafter simply referred to as "front side”) to the rear end side of the holder 3 (hereinafter simply referred to as "rear end side”) and the second wall surface portion 8 that extends from the front side to the rear end side.
  • the second wall surface portion 8 includes a concave groove 8b and a curved surface 8c that is smoothly connected to the concave groove 8b, and comprises an upper surface 33 of the land portion that connects to the three surfaces of the first wall surface portion 7, the concave groove 8b and the curved surface 8c.
  • the first wall surface portion 7 functions as a first concave-curved surface (concave-curved surface with respect to the outermost diameter of the holder 3).
  • the concave groove 8b and the curved surface 8c function as a second concave-curved surface.
  • the first concave-curved surface forms a first chip pocket
  • the second concave-curved surface forms a second chip pocket.
  • the first chip pocket opens toward the outer peripheral side from which the cutting edge 22 protrudes
  • the second chip pocket opens toward the outer peripheral side that is located on the radially opposite side from the cutting edge 22.
  • opens toward the outer peripheral side refers to a state in which a surface that forms a space formed by an opened pocket can be viewed from the outside in the outer peripheral direction of the holder.
  • the phrase "opens toward the front side” refers to a state in which a surface that forms a space formed by an opened pocket can be viewed from the front side of the holder.
  • the surface that forms the space formed by the pocket intersects with the outer peripheral surface and the front surface.
  • the connecting surface 35 comprises a region in which the width in the direction orthogonal to the axis of the holder (hereinafter simply referred to as "width") is widened as approaching from the front side toward the rear end side as viewed from the planar surface.
  • the center portion of the connecting surface 35 is formed into a concave shape that is hollowed toward the inside of the holder 3 relative to the connecting portion of the first wall surface portion 7 and the curved surface 8c.
  • chips may bump into the intersection ridge and be retained on the intersection ridge. Newly generated chips bump into these retained chips and are also retained. If this situation is repeated, the cutting edge 22 may bite the chips.
  • the chips will not be retained on the connecting surface 35 and the chips can be drawn into the chip pocket.
  • the connecting surface 35 approaches the rear end side as approaching the first wall surface portion 7 side from the curved surface 8c side, the chips can be drawn into the first chip pocket.
  • An upper surface 20 of the cutting insert 2 is inclined toward the radial direction and the axial direction from the cutting edge 22 as shown Fig. 18 .
  • the positions of the first chip pocket and the second chip pocket are specified based on a first reference surface X1 that includes an axis 36 of the holder and passes through the cutting edge 22 and a second reference surface X2 that includes the axis 36 of the holder and is orthogonal to the first reference surface.
  • a first tangential line 7f at the upper end of the first wall surface portion 7 and a second tangential line 8g at the upper end of the curved surface 8c (or, on the rear end side relative to the B-B cross-section, the concave groove 8b) intersect at a position away from the first reference surface X1 relative to the upper surface 33 of the land portion.
  • each concave-curved surface that forms the first chip pocket and the second chip pocket can ease the angle between the intersection ridge and the upper surface 33 of the land portion. Accordingly, since the rejection of chips flowing onto the periphery of the upper surface 33 of the land portion toward the cutting edge 22 side can be constrained, the chip-discharging properties during cutting can be further improved.
  • the lower end of the first wall surface portion 7 extends to the lower side relative to the first reference surface X1. Accordingly, since a pocket for discharging chips can be provided on a portion that nears the workpiece during cutting, the biting of chips in this portion can be constrained. For this reason, the chip-discharging properties can be further improved.
  • the cutting edge 22 of the cutting insert 2 is placed into contact with the workpiece 40 to machine the inner diameter of the workpiece. After that, the cutting tool 1 is spaced apart from the workpiece 40.
  • the step in which the workpiece 40 is continuously rotated and the cutting edge 22 of the cutting insert 2 is brought into contact with another portion of the workpiece 40 is repeated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
EP09770250.0A 2008-06-27 2009-06-26 Cutting tool and cutting method using same Active EP2305406B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2008169565 2008-06-27
JP2008170175 2008-06-30
JP2008195736 2008-07-30
JP2008229330 2008-09-08
PCT/JP2009/061720 WO2009157540A1 (ja) 2008-06-27 2009-06-26 切削工具およびそれを用いた切削方法

Publications (3)

Publication Number Publication Date
EP2305406A1 EP2305406A1 (en) 2011-04-06
EP2305406A4 EP2305406A4 (en) 2013-06-12
EP2305406B1 true EP2305406B1 (en) 2017-04-19

Family

ID=41444600

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09770250.0A Active EP2305406B1 (en) 2008-06-27 2009-06-26 Cutting tool and cutting method using same

Country Status (5)

Country Link
US (1) US8516935B2 (ja)
EP (1) EP2305406B1 (ja)
JP (3) JP5100835B2 (ja)
CN (1) CN102066026B (ja)
WO (1) WO2009157540A1 (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5161324B2 (ja) * 2010-03-31 2013-03-13 日本特殊陶業株式会社 中ぐり用切削工具
EP2676751B1 (en) * 2011-02-15 2016-08-10 Kyocera Corporation Cutting tool
KR20140026172A (ko) * 2012-08-24 2014-03-05 대구텍 유한회사 내경 가공용 선삭 공구
JPWO2015129567A1 (ja) * 2014-02-27 2017-03-30 村田機械株式会社 工作機械
JP6442207B2 (ja) * 2014-09-25 2018-12-19 京セラ株式会社 ホルダ、切削工具及び切削加工物の製造方法
WO2016068120A1 (ja) * 2014-10-29 2016-05-06 京セラ株式会社 ホルダ、切削工具及び切削加工物の製造方法
JP6620939B2 (ja) * 2016-04-18 2019-12-18 株式会社ＮｅｊｉＬａｗ 切削用工具
JPWO2018092791A1 (ja) * 2016-11-16 2019-10-17 京セラ株式会社 切削インサート及び切削工具
JP2021524389A (ja) * 2018-05-24 2021-09-13 ノー スクリュー リミテッド 内部冷却の工具ならびに切削インサート、およびその製造方法

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JPH0698524B2 (ja) * 1986-07-29 1994-12-07 三菱マテリアル株式会社 スロ−アウエイチツプ
JP2562563Y2 (ja) * 1990-04-24 1998-02-10 三菱マテリアル株式会社 中ぐりバイト
US5156503A (en) * 1989-06-26 1992-10-20 Mitsubishi Metal Corporation Boring bar tool
JPH042505A (ja) 1990-04-18 1992-01-07 Sumitomo Rubber Ind Ltd 自動二輪車用ラジアルタイヤ
JP3438578B2 (ja) * 1998-04-02 2003-08-18 三菱マテリアル株式会社 中ぐりバイト
SE518027C2 (sv) * 2000-04-20 2002-08-20 Sandvik Ab Skärverktygssytem och medel för att exakt positionera detsamma
JP4385519B2 (ja) * 2000-11-30 2009-12-16 三菱マテリアル株式会社 切削工具
JP2002273608A (ja) * 2001-03-19 2002-09-25 Mitsubishi Materials Corp 内径加工用工具
US6974282B2 (en) * 2002-08-14 2005-12-13 Kaiser Tool Company Toolholder for small size grooving and turning insert
JP2005279855A (ja) 2004-03-30 2005-10-13 Sumitomo Electric Hardmetal Corp ボーリングバイト
JP2007075933A (ja) 2005-09-13 2007-03-29 Sumitomo Electric Hardmetal Corp クーラント孔付きボーリングバイト
SE530182C2 (sv) * 2006-01-10 2008-03-18 Sandvik Intellectual Property Svarvbom för invändig svarvning med fluidkanal
JP4961839B2 (ja) * 2006-06-05 2012-06-27 株式会社タンガロイ 中ぐり工具
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Also Published As

Publication number Publication date
JP2012250345A (ja) 2012-12-20
EP2305406A1 (en) 2011-04-06
JPWO2009157540A1 (ja) 2011-12-15
JP5479554B2 (ja) 2014-04-23
JP2013027974A (ja) 2013-02-07
US20110097167A1 (en) 2011-04-28
JP5451842B2 (ja) 2014-03-26
JP5100835B2 (ja) 2012-12-19
CN102066026B (zh) 2014-01-08
CN102066026A (zh) 2011-05-18
US8516935B2 (en) 2013-08-27
WO2009157540A1 (ja) 2009-12-30
EP2305406A4 (en) 2013-06-12

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